#app{
  height: 100vh;
  background-image: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  display: flex;
  justify-content: center;
  align-items: center;
}

.slider{
  position: relative;
  width: 300px;
  height: 10px;
  background-color: skyblue;
  border-radius: 5px;
}


.number{
  position: absolute;
  top: -35px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  background-color: #fff;
  text-align: center;
  border-radius: 5px;
  font-size: 14px;
  padding: 3px 0;
  color: #333;
}

.number::after{
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border: 5px solid transparent;
  border-top-color: #fff;
}

.mobile_dot{
  position: absolute;
  left: 0;
  top: 50%;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  background-color: #fff;
  transform: translateY(-50%);
  cursor: pointer;
  transition: left .25s linear -.5s;
}